Expand
81y^{2}+36uy+4u^{2}
Evaluate
\left(9y+2u\right)^{2}
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81y^{2}+36yu+4u^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(9y+2u\right)^{2}.
81y^{2}+36yu+4u^{2}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(9y+2u\right)^{2}.
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